We have that problem in some places here. Houses that used to be like a mile from the edge getting closer all the time, then falling off.
Around here che cliffs will be fine for years then one bad year you could lose 10 to 20 ft due to small landslides. Years ago I looked at a bunch of houses in Daly City to buy that had backyards literally 20 feet from the cliffs. I believe my exact words were, these houses won't be here in 50 years. Well, some of those houses were gone in 10 years. Although the view is nice while it lasts.
Seemed like a good idea when they built it at the time. A time-lapse would have been really cool if they had thought of it back then.